Retrieve given color with style alpha applied, packed as a 32-bit value suitable for ImDrawList.
col
Packed ImU32 RGBA color; alpha controls opacity.
alpha_mul
Additional multiplier for the color alpha, combined with the current style alpha.
Packed ImU32 color with the current style alpha and any requested alpha multiplier applied.
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Retrieve given color with style alpha applied, packed as a 32-bit value suitable for ImDrawList.